Bambang Panca Syahputra, Amrin Saragih, Syahron Lubis, and Muhizar Muchtar. “INTERPRETING TECHNIQUES BY A TOUR GUIDE AT THE ANCIENT TOMBS OF RAJA SIDABUTAR”. Researchers World - International Refereed Social Sciences Journal 8, no. 1 (August 23, 2021): 151–158. Accessed August 24, 2025. https://www.researchersworld.com/index.php/rworld/article/view/241.